{"id":581,"date":"2026-07-20T08:23:14","date_gmt":"2026-07-20T08:23:14","guid":{"rendered":"https:\/\/n2-compressor.com\/?post_type=product&p=581"},"modified":"2026-07-20T08:23:53","modified_gmt":"2026-07-20T08:23:53","slug":"lw-6-30-nitrogen-compressor","status":"publish","type":"product","link":"https:\/\/n2-compressor.com\/pl\/produkt\/lw-6-30-nitrogen-compressor\/","title":{"rendered":"LW-6\/30 Nitrogen Compressor \u2013 High-Pressure Oil-Free N2 Booster for 3.00 MPa Process Applications"},"content":{"rendered":"
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LW-6\/30 Nitrogen Compressor \u2013 High-Pressure Oil-Free N2 Booster for 3.00 MPa Process Applications<\/h1>\n

Engineered to deliver 6 m\u00b3\/min at 3.00 MPa discharge pressure, the LW-6\/30 is a two-stage, two-row oil-free piston nitrogen compressor purpose-built for high-pressure nitrogen injection, gas cylinder filling stations, and demanding chemical process applications. Zero oil contamination, robust construction, and optimized for continuous-duty operation at extreme pressure.<\/p>\n

Popro\u015b o wycen\u0119<\/a>
\nView N2 Compressor Series<\/a><\/div>\n

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Product Overview<\/h2>\n

Ten LW-6\/30 nitrogen compressor<\/strong> occupies a commanding position within our oil-free piston compressor family, engineered for applications where extreme discharge pressure is the defining requirement. With a rated capacity of 6 m\u00b3\/min<\/strong> and an exceptional 3.00 MPa discharge pressure<\/strong>, this unit addresses the most demanding high-pressure nitrogen boosting requirements in industrial gas infrastructure, chemical processing, and specialty gas distribution.<\/p>\n

What distinguishes the LW-6\/30 from conventional alternatives is its fully oil-free compression pathway<\/strong> utilizing self-lubricating PTFE composite piston rings and rider bands. At 3.00 MPa discharge pressure, the risk of oil vapor carryover is dramatically amplified compared to low-pressure applications, making the oil-free design not merely advantageous but absolutely mandatory for applications requiring ISO 8573-1 Class 0 certification. The absence of hydrocarbon lubricants eliminates the need for downstream oil-filtration systems that would be both expensive and technically challenging to implement effectively at this pressure level.<\/p>\n

The compressor architecture employs a two-stage, two-row (\u4e8c\u5217\u4e8c\u7ea7)<\/strong> configuration that is thermodynamically essential for managing the extreme pressure ratio required to achieve 3.00 MPa from typical inlet conditions. Each stage is independently cooled through a high-efficiency intercooler, ensuring gas temperatures remain within safe operating envelopes and preserving the dimensional stability of the PTFE sealing elements. The reinforced cast-iron frame and dynamically balanced forged steel crankshaft are engineered for a minimum service life of 120,000 hours<\/strong> under standard maintenance protocols.<\/p>\n

\"LW-6\/30<\/p>\n<\/div>\n

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Technical Specifications \u2013 LW-6\/30<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\nUnit<\/th>\n<\/tr>\n<\/thead>\n
Model<\/td>\nLW-6\/30<\/td>\n\u2013<\/td>\n<\/tr>\n
Wz\u00f3r<\/td>\nTwo-stage, Two-row (\u4e8c\u5217\u4e8c\u7ea7)<\/td>\n\u2013<\/td>\n<\/tr>\n
Pojemno\u015b\u0107<\/td>\n6<\/td>\nm\u00b3\/min<\/td>\n<\/tr>\n
Ci\u015bnienie wylotowe<\/td>\n3.00<\/td>\nMPa<\/td>\n<\/tr>\n
Compressor Size (L \u00d7 W \u00d7 H)<\/td>\n3687 \u00d7 1100 \u00d7 2273<\/td>\nmm<\/td>\n<\/tr>\n
Waga<\/td>\n2.70<\/td>\nt<\/td>\n<\/tr>\n
Moc<\/td>\n65<\/td>\nkW<\/td>\n<\/tr>\n
Wolta\u017c<\/td>\n380<\/td>\nV<\/td>\n<\/tr>\n
Medium gazowe<\/td>\nNitrogen (N\u2082)<\/td>\n\u2013<\/td>\n<\/tr>\n
Lubrication<\/td>\nBez oleju<\/td>\n\u2013<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

* All specifications are rated at standard reference conditions (ISO 1217, Annex C). Actual performance may vary based on site altitude, ambient temperature, and inlet conditions.<\/em><\/p>\n<\/div>\n

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Key Features & Engineering Advantages<\/h2>\n

1. Extreme-Pressure Oil-Free PTFE Sealing System<\/h3>\n

The LW-6\/30 employs a proprietary self-lubricating piston ring and rider band assembly<\/strong> manufactured from high-density PTFE composites specifically formulated for extreme-pressure service. These rings are reinforced with glass fiber and bronze particulates to achieve a coefficient of friction below 0.06 without any external hydrocarbon lubrication. At 3.00 MPa discharge pressure, the partial pressure of oil vapor would be approximately 30 times higher than at 0.30 MPa, making conventional oil-lubricated designs completely unsuitable for high-purity applications. The PTFE composite formulation is rated for continuous operation at temperatures up to 185\u00b0C, ensuring reliable sealing integrity under the intense thermal stress of 3.00 MPa compression. For operators in pharmaceutical, semiconductor, and food-grade nitrogen production, this native oil-free design delivers ISO 8573-1 Class 0 compliance<\/strong> without any downstream purification equipment.<\/p>\n

2. Two-Stage Compression for Extreme Pressure Ratios<\/h3>\n

Ten two-stage compression architecture<\/strong> of the LW-6\/30 is thermodynamically mandatory for achieving the 3.00 MPa discharge pressure target from typical inlet pressures of 0.05\u20130.10 MPa. The overall pressure ratio of approximately 30:1 to 60:1 is split between a low-pressure cylinder and a high-pressure cylinder, with each stage operating at a manageable pressure ratio. A high-efficiency shell-and-tube intercooler between stages removes the substantial heat of compression, maintaining discharge temperatures below 160\u00b0C and preventing thermal degradation of the PTFE sealing elements. Without staged compression, the discharge temperature would exceed 250\u00b0C\u2014far beyond the safe operating limit of any oil-free sealing material. The two-stage design also improves volumetric efficiency by reducing the re-expansion losses that would occur in a single-stage compressor operating at such extreme pressure ratios.<\/p>\n

3. Reinforced Frame for High-Pressure Mechanical Loads<\/h3>\n

The main frame is cast from GG25 gray cast iron<\/strong> with reinforced wall sections, additional ribbing, and integral cooling water passages. The high-pressure cylinder features substantially thicker walls and enhanced structural support to withstand the peak gas forces associated with 3.00 MPa operation. The two-row opposed-cylinder arrangement<\/strong> provides natural first-order force cancellation, which is particularly critical for high-pressure compressors where the peak forces on the pistons can be three to four times greater than in low-pressure equivalents. This mechanical advantage reduces vibration transmission to the foundation and extends the service life of bearings, connecting rods, and crankshaft journals.<\/p>\n

4. Standard 380V Industrial Motor Drive<\/h3>\n

The LW-6\/30 is driven by a 65 kW, 380V, 50Hz three-phase induction motor<\/strong> conforming to IEC 60034-1 efficiency class IE3. The standard low-voltage configuration integrates directly into existing 380V industrial distribution panels without requiring medium-voltage switchgear or step-down transformers. This electrical simplicity reduces both capital expenditure and commissioning complexity, making the unit accessible to a wide range of industrial facilities. The 65 kW power rating is optimized for the 6 m\u00b3\/min capacity at 3.00 MPa, delivering a specific power consumption that is competitive within the high-pressure oil-free compressor segment.<\/p>\n

\"LW-6\/30<\/p>\n<\/div>\n

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Application Scenarios<\/h2>\n

High-Pressure Nitrogen Cylinder Filling Stations<\/h3>\n

The LW-6\/30 is ideally suited for nitrogen cylinder filling operations<\/strong> where high-pressure gas must be compressed into standard industrial cylinders at 15\u201320 MPa filling pressure. While the compressor’s 3.00 MPa discharge pressure does not reach cylinder filling pressure directly, it serves as a highly efficient intermediate booster that dramatically reduces the compression ratio required of downstream high-pressure filling compressors. This staged approach improves overall system efficiency by 15\u201325% and reduces wear on the expensive high-pressure filling equipment. The 6 m\u00b3\/min capacity can support cylinder filling rates of 80\u2013120 cylinders per hour, making it suitable for commercial gas filling stations serving industrial, medical, and specialty gas customers. The oil-free design is mandatory for cylinder filling because any oil contamination would be trapped in the cylinders and delivered to end-users.<\/p>\n

\"LW-6\/30<\/p>\n

Chemical Process High-Pressure Nitrogen Injection<\/h3>\n

In chemical process plants, the LW-6\/30 high-pressure nitrogen compressor<\/a> provides nitrogen for high-pressure reactor inerting, catalyst bed preservation, and emergency nitrogen injection into process vessels operating at elevated pressures<\/strong>. The 3.00 MPa discharge pressure is sufficient to inject nitrogen into process vessels operating at pressures up to 2.4 MPa, maintaining positive inert gas blankets during startup, shutdown, and upset conditions. The oil-free certification is essential for chemical applications where nitrogen contacts catalyst beds or enters process streams that must remain completely free of hydrocarbon contamination. Even trace oil contamination can poison precious metal catalysts, degrade polymerization reactions, or cause off-specification product batches.<\/p>\n

Gas Liquefaction & Cryogenic Storage Pressure Boosting<\/h3>\n

In nitrogen liquefaction plants and cryogenic storage facilities, the LW-6\/30 compresses nitrogen to the high pressure required for liquefaction cycle feed, cryogenic storage tank pressurization, and liquid nitrogen transfer pumping<\/strong>. The 3.00 MPa discharge pressure is suitable for driving nitrogen through the heat exchangers and expansion turbines of small to medium-scale liquefaction plants. The oil-free design prevents oil contamination of the cryogenic equipment, where even microscopic oil residues can freeze and block narrow passages in heat exchangers and expansion valves, causing catastrophic process upsets.<\/p>\n

\"LW-6\/30<\/p>\n

Pipeline Pressure Testing & Hydrostatic Testing<\/h3>\n

The oil and gas industry, chemical plants, and power generation facilities require high-pressure nitrogen for pipeline pressure testing, hydrostatic testing of pressure vessels, and pneumatic testing of process equipment<\/strong>. The LW-6\/30’s 3.00 MPa discharge pressure is suitable for testing pipelines and vessels rated up to 2.4 MPa design pressure (per ASME B31.3, test pressure = 1.5\u00d7 design pressure). Nitrogen is preferred over water for testing in cold climates (preventing freezing), in systems that must remain dry (electrical equipment, gas pipelines), and in applications where water contamination would be difficult to remove. The oil-free design ensures that the test medium itself does not introduce contamination into the tested system.<\/p>\n<\/div>\n

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Material & Construction<\/h2>\n

The LW-6\/30 is constructed from premium materials selected for extreme-pressure nitrogen compatibility, thermal resistance, and extended operational life:<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Component<\/th>\nMaterial<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
Cylinder Block (LP)<\/td>\nGray Cast Iron<\/td>\nGG25 \/ HT250, standard wall thickness<\/td>\n<\/tr>\n
Cylinder Block (HP)<\/td>\nGray Cast Iron<\/td>\nGG25 \/ HT250, heavy-duty wall + reinforced ribbing<\/td>\n<\/tr>\n
Crankshaft<\/td>\nForged Alloy Steel<\/td>\n42CrMo4, Q&T, ISO 1940 G2.5 dynamically balanced<\/td>\n<\/tr>\n
Piston Rings<\/td>\nPTFE-Glass-Bronze Composite<\/td>\nExtreme-pressure rated, self-lubricating, 185\u00b0C max<\/td>\n<\/tr>\n
Rider Bands<\/td>\nPTFE Composite<\/td>\nPiston guidance, anti-scuffing, wear rate <0.04 mm\/1000h<\/td>\n<\/tr>\n
Valve Plates<\/td>\nStal nierdzewna<\/td>\nSS316, high-pressure concentric ring spring design<\/td>\n<\/tr>\n
Connecting Rods<\/td>\nForged Steel with Babbitt Bearings<\/td>\nHeavy-duty, precision-machined, oil-lubricated big end<\/td>\n<\/tr>\n
Intercooler<\/td>\nCarbon Steel Shell \/ SS316 Tubes<\/td>\nASME VIII Div.1, 1.5\u00d7 hydrotest, 30 min hold<\/td>\n<\/tr>\n
Aftercooler<\/td>\nCarbon Steel Shell \/ SS316 Tubes<\/td>\nHigh-pressure finned tube, 32\u00b0C cooling water rated<\/td>\n<\/tr>\n
High-Pressure Piping<\/td>\nSeamless Stainless Steel<\/td>\nSS316, ANSI Class 900 flanges<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

All pressure-bearing components are designed and fabricated in strict accordance with ASME BPVC Section VIII Division 1<\/strong> or Chinese GB 150 standards. Every weld joint undergoes 100% radiographic inspection (RT) per ASME Section V, Article 2, and each completed pressure vessel is subjected to a hydrostatic pressure test at 1.5 times the maximum allowable working pressure (MAWP) for a minimum hold period of 30 minutes. High-pressure piping systems are fabricated from seamless SS316 with ANSI Class 900 flanged connections to ensure leak-tight integrity at 3.00 MPa operating pressure.<\/p>\n

\"LW-6\/30<\/p>\n<\/div>\n

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Installation & Maintenance Guidelines<\/h2>\n

Foundation & Structural Requirements<\/h3>\n

The LW-6\/30 has a dry weight of 2.70 tonnes and a center of gravity approximately 800 mm above the baseplate. Due to the two-row opposed-cylinder design, unbalanced forces are minimal despite the extreme pressure operation, permitting installation on a reinforced concrete inertia block of 5\u20136 tonnes<\/strong>. The block should be mounted on elastomeric vibration isolators (natural frequency 7\u201310 Hz). Minimum clearance requirements: 1.2 m on the non-drive side for valve access, 1.0 m on the drive side for motor maintenance, and 1.5 m overhead for crane access. Special attention must be paid to the high-pressure discharge piping, which must be properly supported, anchored, and stress-relieved to prevent vibration-induced fatigue at 3.00 MPa. All high-pressure piping must be designed in accordance with ASME B31.3 Process Piping standards.<\/p>\n

Cooling Water System Design<\/h3>\n

Cooling water demand is approximately 15 m\u00b3\/h<\/strong> at an inlet temperature not exceeding 32\u00b0C. The water distribution circuit supplies the cylinder jackets and intercooler in parallel. Given the extreme pressure ratio, the intercooler is absolutely critical for thermal management and must receive priority cooling water flow at all times. Water quality specifications: pH 6.5\u20138.5, total dissolved solids < 500 mg\/L, chloride content < 50 mg\/L (to prevent SS316 tube corrosion), suspended solids < 30 mg\/L, and total hardness < 300 mg\/L as CaCO\u2083. A closed-loop cooling tower with side-stream filtration and chemical treatment is strongly recommended for all installations to prevent scale formation and corrosion in the high-pressure heat exchangers.<\/p>\n

Preventive Maintenance Schedule<\/h3>\n
\n\n\n\n\n\n\n\n\n\n
Interval<\/th>\nService Item<\/th>\nAction Required<\/th>\n<\/tr>\n<\/thead>\n
Daily<\/td>\nOperational Inspection<\/td>\nCheck vibration, abnormal noise, cooling water flow, discharge pressure, temperature<\/td>\n<\/tr>\n
250 hours<\/td>\nValve Plate Inspection<\/td>\nRemove and inspect suction\/discharge valves for carbon deposits, spring fatigue, cracking<\/td>\n<\/tr>\n
1,000 hours<\/td>\nPiston Ring Wear Assessment<\/td>\nMeasure ring groove clearance; replace rings if clearance exceeds 0.20 mm<\/td>\n<\/tr>\n
3,000 hours<\/td>\nIntermediate Overhaul<\/td>\nReplace all piston rings, rider bands, and valve plate assemblies<\/td>\n<\/tr>\n
6,000 hours<\/td>\nMajor Overhaul<\/td>\nInspect crankshaft journals, measure main bearing clearances, replace bearings if >0.08 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The oil-free design of the LW-6\/30 dramatically simplifies maintenance compared to lubricated alternatives. There are no oil changes, no oil analysis, no filter replacements, and no separator cartridge changes. The primary consumable wear items are the PTFE piston rings and rider bands<\/strong>, which typically achieve 3,000\u20135,000 hours of service life under clean nitrogen conditions at high pressure. The extreme-pressure valve plates may require more frequent inspection than low-pressure equivalents due to the substantially increased mechanical stress, but the overall maintenance burden remains significantly lower than oil-lubricated systems.<\/p>\n

\"LW-6\/30<\/p>\n<\/div>\n

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Compliance & Safety Certifications<\/h2>\n

The LW-6\/30 nitrogen compressor is designed, manufactured, and tested to meet or exceed the following international standards and regulatory frameworks:<\/p>\n

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Pressure Equipment Directive<\/strong>
\nASME BPVC Section VIII Div.1, GB 150-2011, PED 2014\/68\/EU Module A<\/span><\/div>\n
Electrical & Machine Safety<\/strong>
\nIEC 60034-1 (IE3 efficiency), IEC 60204-1, ISO 12100 machinery safety<\/span><\/div>\n
Oil-Free Air Quality<\/strong>
\nISO 8573-1 Class 0 (Oil Content), independently tested by T\u00dcV Rheinland<\/span><\/div>\n
Quality & Environmental<\/strong>
\nISO 9001:2015 (Quality Management), ISO 14001:2015 (Environmental Management)<\/span><\/div>\n<\/div>\n
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\u26a0\ufe0f Critical Safety Advisory \u2013 Extreme High-Pressure Operation<\/strong><\/p>\n

Nitrogen is classified as a simple asphyxiant gas. At 3.00 MPa discharge pressure, the risk of rapid gas release and oxygen displacement is severely elevated. All LW-6\/30 installations must incorporate continuous oxygen deficiency monitoring in the compressor room and all adjacent areas. High-pressure discharge piping must be equipped with pressure relief valves rated at 110% of MAWP and rupture discs as secondary protection, with discharge directed to a safe location. All high-pressure piping and fittings must be designed, fabricated, and inspected in accordance with ASME B31.3 Process Piping standards. Ventilation systems must maintain ambient oxygen above 19.5% per OSHA 29 CFR 1910.146. Emergency shutdown interlocks should activate at 19.5% O\u2082 (alarm) and trigger automatic isolation at 18.0% O\u2082 (hard shutdown). Personnel must be trained in extreme high-pressure gas safety protocols before operating or maintaining this equipment. Lockout\/tagout procedures are mandatory for all maintenance activities on high-pressure systems.<\/p>\n<\/div>\n

\"LW-6\/30<\/p>\n<\/div>\n

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Performance & Efficiency Analysis<\/h2>\n

The LW-6\/30 achieves a specific power consumption of approximately 10.83 kW per m\u00b3\/min<\/strong> of nitrogen delivered at 3.00 MPa discharge pressure. This specific power figure reflects the thermodynamic reality of extreme-pressure compression, where the work required increases substantially with pressure ratio. Within the high-pressure oil-free piston compressor segment (discharge pressure >2.50 MPa), this efficiency is competitive and significantly superior to diaphragm compressors, which are the primary alternative for oil-free high-pressure service. For comparison, oil-lubricated reciprocating compressors in similar extreme-pressure applications typically consume 11.5\u201313.0 kW\/m\u00b3\/min, while diaphragm compressors may exceed 18 kW\/m\u00b3\/min.<\/p>\n

Over a standard 8,000-hour annual operating schedule, the LW-6\/30’s efficiency advantage versus less efficient alternatives yields approximately 48,000\u201396,000 kWh of annual energy savings<\/strong>. At $0.08\/kWh, this represents $3,840\u2013$7,680 in direct electricity cost reduction per year. However, the primary economic driver for LW-6\/30 selection is typically the elimination of oil-related consumables and the avoidance of downstream oil-removal equipment<\/strong> that would be mandatory with lubricated alternatives. At 3.00 MPa, the partial pressure of oil vapor is approximately 30 times higher than at 0.30 MPa, making downstream oil-filtration systems both less effective and more expensive. The total cost of ownership for extreme high-pressure nitrogen compression<\/a> is reduced by an estimated 30\u201345% over a 10-year operational life when oil-free operation is compared to lubricated systems with full downstream purification.<\/p>\n

The absence of oil in the compression path is particularly critical at 3.00 MPa because oil contamination becomes progressively more concentrated and more difficult to remove as pressure increases. At this pressure level, even sub-ppm oil contamination can cause significant problems in downstream process equipment, catalyst beds, and cryogenic systems. The LW-6\/30’s native oil-free design eliminates this challenge entirely, delivering consistent ISO 8573-1 Class 0 nitrogen regardless of operating pressure.<\/p>\n<\/div>\n

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Customization & OEM Capabilities<\/h2>\n

We offer comprehensive customization options to adapt the LW-6\/30 to specific site conditions, integration requirements, and end-user specifications:<\/p>\n